Very Urgent ---Need to delete the log files when the disk used% greater than 85% using df -k*

Hi,
I am new to Shell scripts.
I have an urgent requirement to find the disk space using "df -k".
from that output,I need to check the used% whether greater than 85%.
if it is greater than 85% then need to delete my log files.
It is very urgent please some one help me.
Thanks in Advance
Anandbarnabas

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